Biology Internal Assessment
How does the heart rate (pulse rate) change with increasing exercise intensity?
Background:The cardiovascular system includes blood, blood vessels and the heart. When the blood flows through the body, it carries oxygen, hormones and enzymes to cells and transport carbon dioxide and other wastes for removal from the body. The heart has four chambers, two on the right (right atrium and right ventricle) and two on the left (left atrium and left ventricle). The right side receives blood from the body and transports it to the lungs. The lungs add oxygen to the blood and remove carbon dioxide. The left side receives blood from the lungs and pumps it back to the body.“The heart is innervated by the autonomic nervous system, but it also has its own system to generate electrical impulses that stimulate cardiac muscle to contract. These electrical impulses can be recorded in an ECG (electrocardiogram) and used to detect problems with the heart.”
Exercising use up large amount of oxygen, as it uses lot of oxygen. The oxygen in the blood is used up faster to feed the muscles and keep them working properly. When more oxygen and glucose has to be supplied during exercise, the heart that pumps blood throughout the body has to beat harder to meet the supply of oxygen and glucose to the demand of the muscles. As a result, while exercising, more energy is required, and so the heart has to work harder to supply blood, increasing heart beat rate.
Aim: Examine the changes in the heart rate with increasing exercise (skipping) intensity.As a person exercise, more energy is used. More oxygen is used up to supply energy to the muscles. So, the demand for oxygen increases, which is supplied through blood. So, the heart has to pump blood faster to the parts of muscles and body, thus increasing the heart rate/pulse rate.
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